Speed-governor for talking-machines.



G. E. WOODS.

SPEED GOVERNOR FOR TALKING MACHINES.

APPLICATION FILED FEB. 4, 1914.

1, 1 21,887, Patented Dec. 22, 1914;

srn rns rn'rs CLINTON E. FJ'OODS, OF BBlDGEPORT, CONNECTICUT, ASSIGHOR TO AMERICAN GRAIPHOPHONE COMPANY, OF BRIDGEPOB/T, CONNECTICUT, A. CQEFOBATION OF WEST VIRGLNIA:

- SYEED-GOVERNOB YEGE TALKIKG-MACHINES.

LiQLssr.

Specification of Lettersretent.

Patented Dec. 22, 191%..

Application filed February l, 191%. Serial 1 10. 816,569. e

This invention relates to speed governors,

and more particularly to speed governors for governing and indicating the speed of motors for talking machines.

. The object of the invention is to provide a simple and efiicient device of this character,

which shall be efficient in governing or controlling the speed of the talking machine motor, and accurate in indicating the speed or number of revolutions per minute which the motor is imparting to the record tablet of the talking machine.

With this object in view, the invention consists in the combination of elements hereinafter more particularly described and pointed out in the claims.

The inventive idea may be expressed in a variety of forms, one of which is shown in the accompanying drawings, for the purpose of illustrating the invention, but not for the purpose of defining the limits of the invention, reference being had to the claims for this purpose.

In said drawings Figurel is s top plan view of the mechanism, with the inclosing casing thereoi partly in section and partly broken away; Fig. 2' is a section on the line 22 of-Fig. 1, looking in the direction of the arrow; Fig. 3 is a side elevation, with the inclosing casing and some of the parts shown in central section; Fig. i is a. front -face view, partly broken away; and Fig. 5

is a detail of the friction pad yoke and connected parts.

Referring to the drawings, in which like reference numerals indicate corresponding parts throughout the several views, 1 is a shaft operatively connected to the motor of the talking machine, and with one end taking bearing in the walls of the casing :2, suitably This shaft 1 has on the end thereof, and within the casing 2,'a worm gear 3 meshing with a worm i formed on the governor shaft 5, which has bearing at one end, in the Well of the casing, and at the other end in a vertical E. Wooos,

partition 6, as will be clearly seen by an in spection of Fig. 3. Keyed to the governor shaft 5, by a set screw 7, is a disk 8, to

,which there are pivoted two pairs of weights 9,9, and 10, 10, one member of each pair of weights being pivoted on a pivot 11 passing through the disk 8, and one member of each pair of weights being pivoted on a pivot 12 also passing through the disk 8, as is shown in dotted lines in Fig. 1. The four weights 9, 9, and 10, 10, are all alikeiin construction, and therefore a description of one will sufiice for all four. These weights are preferably shaped as shownin Fig. 2, and have an anti-frictional roller 13 pivoted in a cut-away space therein on a pivot 1%, which is indicated in dottedlines in Fig. '2.

The weights are held in their innermost position, close to the shaft 5, by springs 15, 15, and when the shaft .5 is revolved by the action of the motor, the weights, under the influence of centrifugal force, moveoutward toward the periphery of the disk 8.

Mounted to slide on a bushing 16 secured to the shaft 5 on the forward side of the disk- 8, is a sleeve .17, which sleeve carries a circuler flange or 'disk 18, and a. spring 19 is interposed between said flange or disk, 18 and the partition 6. On the disk 18 are two cam surfaces 20, 20, the lowest points of which cam surfaces are opposite the anti frictional rollers 13 on the weights when the machine is not in motion, and the weights occupy the position shown in Fig. 2. When, however, the weights are thrown outward under the influence of centrifugal force, the anti-frictional rollers 13, acting on the Cain surface 20, 20, force the disk '18 away from the disk 8, that is, from the full line to the dotted line position in Fig. 3, this movement of the disk 18 being against the tension of the spring 19. Pivoted to a depending lug 21 on theinterior wall of the casing 2, is a bell-crank lever 22, having a fork or yoke 2-3 (Fig. pivoted therein, so as to turn around '3. retical axis, said yoke having the friction pads 24: thereon, which pads are carried in front of the disk 18. A. micrometer screw 25, isscrew-threaded into the walls of the casing 2, and bears flange 28. This sleeve 27 is also provided with a circular flange or disk 29, similar to the disk 18, and the disk 29 is provided with cam surfaces 30, 30, corresponding to the cam surfaces 20, 20, on the disk 18, which cam surfaces are opposite the anti-frictional rollers 13 on the weights 10, and when the shaft 5 is revolved by the motor the Weights 10, 10, move outward, under the influence of centrifugal force, and the rollers 13,13, acting on thecam surfaces 30, 30, force the disk 29, and with it the sleeve 27 and the flange 28, from left to right in Fig. 3, against the tension of a spring 31 reacting between the sleeve 27 and the end of the worm 4 on the shaft 5. This movement of the sleeve 27 is employed to actuate an indicator or pointer 32 (Fig; 4), which acts, in conjunction with a scale 33, to indicate the speed at which the motor is moving.

The connection between the moving sleeve 2 27 and the pointer 32 is secured as follows:

Keyed to a shaft 34 is a lever arm 35 (Fig.

3), which is held in operative engagement with the flange 28 by a spring 36 engaging the lower arm 37 of the lever arm 35. The end of the lever arm 35 may bear directly against the flange 28, if desired, but preferably I place an adjusting screw 38 through the end of the lever, as shown in Fig. 3, permitting the inner end of the screw to bear against the flange. This is for the purpose of accurately adjusting the device, to the end that the pointer 32 may be made to exactly indicate the number of revolutions per unit of time imparted to the record tablet.

Keyed to the shaft 34 is a lever arm 39, which normally rests above a lever arm 40 keyed to a shaft 41 extending from front to rear of the casing 2, and having bearing in the walls thereof. The shaft 41 has secured to its forward end, and at a point in front of the partition 6, a lever arm 42 (see Figs. 1 and 4), and the pointer 32 is keyed to a hollow drum or hub 43, mounted to turn on a hollow projection 44 supported in the partition 6 and the dial face 45, which hollow projection, as here shown, also forms the bearing for the forward endof the shaft 5. A cord or band 46 (Fig.4) is secured at one end to the end of the lever arm 42 on the shaft 41, and the other end of the cord is wound around the drum 43 .and secured thereto, as shown in Figs. 3

and 4. A light spring 47, shown in dotted lines in Fig. 4, is also secured to the hollow drum or hub 43 at one end, and has the other end secured to the partition 6. The

index-scale 33 may, if desired, be covered with a glass or other transparent froTnt 48, though this may be omitted.

The parts are so adjusted and arranged that when the machine is standing still, the pointer 32 rests opposite the zero point on'the scale 33, with the cord 46 wound around the drum 43. i

Operation: When the motor in motion, revolution is imparted to the shaft 5 through the worm gear.3 and the'worm 4, causing the weights 9, 9, to fly out, under the influence of centrifugal force, thus moving the disk 18 from the full to the dotted line position of Fig. 3, where it isbrought in contact with the friction pads 24,24, whose position is adjusted by the micrometer screw 25 to regulate the amount of-friction between the disk 18 and the pads 24, and thereby govern the speed of the motor. At the same time, but independently of the centrifugal Weights 9, 9, the weights 10, 10, are thrown outward by centrifugal force, shifting the disk29 from left to right (Fig. 3), thereby rocking the shaft-34, through the lever arm 35, and causing the ar1n39 on said shaft to depress the leverarm 40 on the shaft 41, and thereby rock said-last named shaft. This rocking action serves to depress the arm 42 on said shaft, and unwind the cord 46 from the drum 43, revolving said drum, .and with it the pointer 32, against the tension of th'elight spring 47, which spring serves, when the motor is brought to rest, or the speed of the motor is lessened, to move the index pointer 32 to or toward the zero point.

It will be observed that, while the action of the disks 18 and 29 is each dependent upon the speed of the shaft 5, nevertheless these two disks perform their functions each independently of the other. This is important, since it has been found that inaccuracies occur in the indicating pointer ,if it is moved through the action of the 1. In a device of the character described,

the combination of a motor-driven shaft, an element secured to and revolving with said shaft, two pairs of centrifugally oper- :ited weights pivoted to said element one pair on each side'thereof, two disks slidably mounted on said shaft to revolve therewith and. on opposite sides of said element, cam

surfaces on said disks in operative engagemares? ment with said weights, a braking device in operative relation with one of said disks, and an indicatingdevice in operative relation with the other disk.

'2. In a device of the character described, the combination of a motor-drivenshaft, a disk secured to said shaft and revolving therewith in a plane at right angles to the axis of the shaft, a pair of weights pivoted on the opposite faces of said disk near its periphery, cams slidably mounted on said shaft on opposite sides of said disk and in operative relation with said weights, a braking device in operative relation with the cams on one side of said disk, and an indicating device .in operative relation with the cams on the other side of said disk.

3. In a device of the character described,

the combination of'a motor-driven shaft, a

' disk secured thereto and revolving therewith the combinationof a casing, a motor-driven shaft mounted in said casing, an indicating pointer and dial in front of said-casing, a

disk lying in a plan'e at right angles the axis of said shaft and keyed thereto, centrifugally operated weights pivoted to the front side of said disk, brake mechanism operated by said weights, means for adjusting said brake mechanism, a second pair of centrifugally operated weights pivoted to the rear side of said disk near its periphery, and operative connections between said second pair of weights and said pointer.

5. In a device of the character described, the combination of a casing having a partition wall, a motor-driven shaft having bearing in said partition wall and in an end wall of the casing, an indicating pointer and dial infront of said partition wall, a disk secured to said shaft in a plane at right angles to the axis thereof, with four weights simi: lar in size and weight pivoted to said disk near its periphery two on either side thereof, a brake mechanism, operative connections between said brake mechanism and the pair of Weights on the front side of said disk, and operative connections between said pointer and the pair of Weights on the rear side of said disk.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

.OLINTON E. WOODS. Witnesses:

Joan E; Pnrnm. 

